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GTX 470 shutting down with HX850W


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I am powering my build, which includes a Gigabyte 470 GTX Super OverClock, with an HX850W PSU from Corsair.


I am trying to overclock my graphic card. It was stable under OCCT-GPU at 770 Mhz, with a voltage of 1,012V. The temperature was reaching 89 degrees, which is still acceptable for that card. OCCT-GPU started giving me errors at 775 Mhz, so I increased the voltage to the next available increment with MSI afterburner, which was 1,025V. After running OCCT-GPU for maybe 30 seconds, the graphic card just shut down. The temperature was at 89 degrees at that point. Whenever I try that same experience again, it inevitably gives the same result.


When I say shut down, I mean that the monitor loses signal. Besides that, the computer seems to continue working and the keyboard LEDs are still responsive. After that, I need to shut down the computer by keeping the power button pressed for a few seconds. Pressing the reset button doesn't enable the graphic card to "re-post".


From what I could gather on the internet, it seems to be symptomatic of not enough power being delivered to the graphic card.


Right now, the two captive dual PCI-E 8 pins (6+2) cables from the PSU are plugged into my graphic card's 2 PCI-E 6 pins. Is this an ideal setup? or shall I use two modular PCI-E cables instead?


I have a multimeter at home and maybe I could use it to measure some values, but I do not really know what I am supposed to be looking out for or how to do it.


I hope someone can help me!


Thank you for reading me


PS: if that can help, my processor, an i7 950 is overclocked at 4 Ghz, using a 23x174 configuration. My Vcore is 1.23V, QPI/VTT is 1.22V and IOH Core is 1.2V, the other voltages are at default values. My ram is running at 1740 Mhz, with a voltage of 1.64V and timings of 8-8-8-24 2T.

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Its unlikely that your problems are due to the PSU not supplying enough power to your components, the HX850 should have plenty of power for this setup. The way you have the PCIE cables pluged into the graphics cards sounds ideal, I would leave it that way, but you might want to try the other cables just to see if you can duplicate the same problems. It sounds more like a motherboard issue to me, likely related to the BIOS. I would make sure that you have the latest BIOS installed, and you may want to test the PSU in a different system to see if you can rule out the PSU completely. If all else fails and you think that replacing the PSU could resolve the problem then we can definitely give it a try, but from what you describe, it doesn't seem like the most likely cause.


Request an RMA

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Yes definitely try a different PCIE cable. I had a issue one time where I couldnt boot into windows and I had to diagnose everything. I thought the Hard drive had failed and was about to replace it when I decided to try a different sata cable and I was up and running again.
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Not only does that PSU provide ample power for your setup, nvidia cards will also display a warning in windows if they are not getting enough power.


It's obvious that your setup is failing because of your overclocking, 89 degrees is very hot for a card and despite what you may think about it being acceptable everybody's card is different. It depends on who's revision of the card you're using and they can have different stock heatsinks and fans, etc. Also, chip to chip variance among completely identical cards is VERY common with respect to how much you can OC.

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